Paz is the Spanish word for “peace” and regardless of its meaning the PAZ mission indeed constitutes a flagship mission of the Spanish Space Strategic Plan (Programa Nacional de Observación de la Tierra por Satélite) established between 2007 and 2011. The plan is based on two complementary satellites with PAZ as a radar satellite and the Ingenio satellite covering the optic needs.
The PAZ mission is set-up as dual-use mission serving the civil and military sector. It will be used for applications of earth observation as welll as surveillance purposes. Probably the latter could explain why the satellite was named as “PAZ”. The Paz mission is funded and owned by the Spanish Ministry of Defence and managed by the Spanish communications company Hisdesat. The applicability in the earth observation domain will range from environmental monitoring, protection of natural resources, surface monitoring, city and infrastructure planning, monitoring of natural catastrophes up to high-resolution mapping, while its usage in the intelligence sector will cover military operations, border control and enforcement of international treaties. It will also contribute to the Copernicus Programme of the European Commission.
The PAZ satellite is operated in constellation with the SAR fleet of the German TanDEM-X mission (Public Private Partnership (PPP) between the German Aerospace Centre (DLR) and Airbus Defence and Space) with TerraSAR-X and TanDEM-X as its satellites. The constellation was agreed on both sides by Hisdesat and Airbus Defence and Space as the operator of the two German satellites and offers the advantages of an optimized revisit time, increased coverage and improved service. According to Hisdesat “numerous activities that require large quantities of timeous data, like crisis management or the monitoring of surface movements, will benefit from this new constellation.”
With a great delay PAZ finally was launched on 22 February 2018 on board of a Falcon 9 rocket by SpaceX from Vandenberg Airforce Base in California, United States. The original launch was scheduled from the Yasni Launch Base in Russia for 2014, but was cancelled with the geopolitical conflict arising in the Crimea region. At the moment the Paz satellite is in the commission period.
Like the TerraSAR-X and TanDEM-X satellite, PAZ was built by Airbus Defence and Space in strong collaboration with Hisdesat. It uses a Synthetic Aperture Radar and operates with X-band at a wavelength of around 3,1 cm in order to be compatible within the two other satellites of the constellation. According to radar technology it records day and night and is weather independent – almost weather independent, as heavy rain clouds reflect the radar wave. With the capability of two polarization modes at the same time the satellite will indeed also be used to detect heavy precipitation occurrences. Planned for a flight time of 5,5 years, PAZ will orbit the Earth 15 times per day and cover an area of 300.000 km² daily up to a resolution of only 25cm. It flies at an altitude of 514km in the same orbit as TerraSAR-X and TanDEM-X. Equipped by an Automatic Indentification System PAZ will simultaneously combine AIS signals from ships and SAR imagery contributing important monitoring capabilities for the maritime domain.
The Spanish Space Strategic Plan constitutes an important support for the development of the Spanish space industry. For the construction of the PAZ satellite, Airbus as main contractor led a team of 18 European companies, whereas Spanish space companies were heavily involved in the development of the active SAR sensor enabling to expand know-how and enhance the competitiveness in the global space market. According to Miguel Ángel Panduro, Head of Hisdesat, “the PAZ programme is already a success story for Spain’s industrial development. It has created hundreds of skilled jobs over the years, and stimulated research, development and innovation activities in Spain.”